Alfred b



@with gratta gettati @fitta IMPROVEMENT IN LET-OEE ANDv TENSION FOR YARNS, THREADS, 6to.

@te dgchule referat fn in tlgrse tetters Entert :mh making mi nf tige sante.

TO' ALL WHOM IT MAY CNCERN:

Be it known that I, ALFRED B` EL3?, of Newton, in the count)1 of Middlesex, aridState of Massachusetts,`

have invented new and useful improvements in Let- Offs and Tensions for'Yarns, Threads, 5to.; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation ofthe same, reference being had to the accompanying drawing, forming a part of this specification. In the drawings- Figure 1 is a s ide elevation. f

Figure 2 is a modification of the same.

Figure 3 isanelevation'of the opposite side, showing also other modifications.

A A is the supporting-frame. B is the yarn-beam, and C the cloth-beam, placed in suitable bearings. D is a rod or bar, over which the yarn from the yarn-beam passes. From this bar depends a rod, E, having aslot at F, through -which-is placeda bolt conniug the rod to the frame, and allowing lit to slide up and down. The

rod E is attached or pivoted at g to a lever, G H, which lever is pvoted at I to the frame. The bolt or setscrew at F may be changed in position so as to place the rod E at different angles to the lever GrA H, if desired. The short arm of this lever rests upon the outside head of the yarn-beam, in fig. I, and is held there by a spring, J, pressing upon it. This spring, which is spiral, is made to encircle a rod fastened to and passing from 'the upper surfaceof H upward through a small ledge on the frame at L, and rests upon a. sleeve K, having a setscrew for the purpose of regulating the pressure of the spring. The Vlever-arm 'H is intended to act as a. brake upon the head of the yarn-beam, and the friction is regulated by the spring J and movable sleeve K. As the yarn is drawn from the beam B over the bar D, the rod E and the long arm of the lever G will be depressed, and the brake or spring-presser foot H will be raised, and allow the beam to revolve and the yarn to be given off as desired. The pull required to release the presser-foot is regulated by the spring and movable sleeve. Instead of the rod E pressing upon the long arm of the horizontal lever at G, a single bent lever, D I H, iig.E 2, may be used, pivoted at I. In this case the pull of the y-'arn will Vdepress the long arm D I of the lever, and release the short arm until a sutlicient amount of yarn is delivered, when the presserffoot is again depressed. In.both.

these cases the presser-foot operates directly upon the periphery of the head ofthe yarn-beam, and retards or stops its revolution by means of friction on the beam, regulated at discretion. In tig'. 3 thejhead of the yarnbeam is furnished with lugs, M, and in this case the end of the lever-'arm H resting upon theperiphery of' the head presses against the front face of the lug, andiprevents the beam from revolving.. This arm of' the presserfoot r'nay be held down by a spring similar to J in fig. 1, and the pressure regulated in the same manner or otherwise, as by spring R.V When the pull of' the yarn upon the bar is strong enough to overcome the spring pressure upon H, the arm D I will be depressed, H will be raised above the point of the lug, andthe beam will revolve to be brought un by the next lug when the -pull upon the yarn relaxes. In order to prevent the too sudden blow of the front face of the lug upon the end of the arm H, a spring, X, may be used at the end of this arm to receive the blow. Instead of this `last method,-a lever, NO, pivoted at P to the frame, may be used, the end of the long a1'm N pressing against the front face ot' the lug. In this case the direct pull of the yarn from the yarn-beam will bring the lug against the `end of the lever, and, when strong enough, will overcome and depress it, and puss by it, and so give o' its yarn as required, To regulate this a spring, which may be adjustable like Jiu g. l, is made to press upon the arm O ofthe lever, or to pull upon the arni N, as Q, and the power of this spring must be overcome before the lug will pass the other end of the lever and the yarn be givenol.' In this case the bent lever or presser-foot will be dispensed with, and the bar D will be made stationary. To prevent the too sudden blow of, the lug, as the head revolves, upon the arm N, a springX may be used to receive the force of the blow. When the lugged head is used, the friction presser-foot is dispensed with. Some may prefer one for some purposes over the other. In'these cases the pull of the yarn as the weaving progresses, is made to regulate the giving oil` of the yarn from the beam as it is wanted for the operations ot' the heater and the taling up oi' thecloth. These devices, instead of operating directly upon the head of the yarn-beam, vmay be made to operate upon wheels or pulleys connected bysuitable gearing with the beam. The devices in fig. 1 inay be made essentially self-regulating, the yarn as it unwinds constantly changing its angle and pull upon bnr D, and essentially varying the pull to meet the varying requirements of the case. In order to produce an even tension upon the yarn I use the following device: a is a bar or rod over which the yarn passes from the beam. b is a rubber roll resting on the va-rn over the rod a. By means of a spning,'c, and thumb-screw, d, the pressure of the roll b upon the yarn lying between it andthe roda can be regulated at pleasure. T he elastic nature of the roll will give avery even pressure upon the threads acr'oss'the whole rod, which otherwise could not be accomplished. The tension-rod and roll maybe used inv some cases without the presser-foot or other devices.

What I claim, and desirev to secure by Letters Patent,`is 1. The bar.D, lever D G H or D I H, and spring d, combined and operating substantially as described.

2. Regulating the giving o' of the yarn by means of lever N..O and spring-Q, operating against the lugs of a. revolving wheel, substantially ini the manner described.

3. Thecoinbinatiou of a spring, az, with the end of the presser-foot H, or the arm N, to receive the blow of the lug, substantially asa.nd for the purpose described.

4. Applying and regulating the tension upon the yarn by means of the adjustable elastic presser-roll, operating substantially as described.

In Witness whereof I have subscribed the above specification and claims.

ALFRED B. ELY.

W'itnesses: A

W. B. ELY, ALFRED ELY 

